I have the same problem with ATI 4850 and Catalyst 9.8 - CMSF crashes just few minutes in the game. I've bought British Forces and haven't had a chance to play it yet, that sucks! I don't want to revert to 9.3 drivers, as 9.8 brought a great improvements to ARMA2 and some other new games. I just hope ATI will find a solution for this problem soon...